Hitachi ShadowImage for z/OS user guide (HIT9503-96009, January 2008)

Figure 20 Siz and TCz: Shared T-VOL/M-VOL

• This conﬁgurationdoesnotallowSizandTCztocopyatthesametime.AddtheSizpairﬁrst, and

then split the pair before creating the TCz pair. You must suspend the TCz pair in order to resync

the Siz pair

. The TCz pair status cannot be changed when the Siz pair is in the V-Split status.

• When you use the Siz and TCz shared conﬁguration, you must either use the PPRC command

to perform the Steady Split operation, or use the Remote Web Console to conﬁrm the pair

statuses. You can perform the Steady Split operation by specifying the CSUSPEND parameters

(Byte 7 = ‘M’, Byte 8 = ‘P’, Byte 9 = ‘S’). For more information about the PPRC commands,

see Chapt

er 5 on page 99.

Usually TCz and URz can share the volumes with Siz. However, in some cases, you cannot create Siz

pairs using the volume shared with TCz and URz.

NOTE:

Aprimary

volume (P-VOL) of URz means a primary data volume of URz. A secondary volume (S-VOL)

of URz means a secondary data volume of URz.

The following conﬁ guration shows an example of a volume functioning as both an URz S-VOL and a TCz

M-VOL. In this conﬁguration, you cannot use this volume as the S-VOL of a Siz pair.

Hitachi ShadowImage for z/OS user guide